Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(vi)

Kazuya Okuno; Hideki Kato; Junie Jhon M. Vequizo; Akira Yamakata; Hisayoshi Kobayashi; Makoto Kobayashi; Masato Kakihana

doi:10.1039/c8ra07830k

Expansion of the photoresponse window of a BiVO₄ photocatalyst by doping with chromium(vi)

Kazuya Okuno, Hideki Kato, Junie Jhon M. Vequizo, Akira Yamakata, Hisayoshi Kobayashi, Makoto Kobayashi, Masato Kakihana

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Doping of Cr⁶⁺ into BiVO₄ was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag⁺ or Fe³⁺ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.

Original language	English
Pages (from-to)	38140-38145
Number of pages	6
Journal	RSC Advances
Volume	8
Issue number	67
DOIs	https://doi.org/10.1039/c8ra07830k
Publication status	Published - 2018
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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title = "Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(vi)",

abstract = "Doping of Cr6+ into BiVO4 was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag+ or Fe3+ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.",

author = "Kazuya Okuno and Hideki Kato and Vequizo, {Junie Jhon M.} and Akira Yamakata and Hisayoshi Kobayashi and Makoto Kobayashi and Masato Kakihana",

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T1 - Expansion of the photoresponse window of a BiVO4 photocatalyst by doping with chromium(vi)

AU - Okuno, Kazuya

AU - Kato, Hideki

AU - Vequizo, Junie Jhon M.

AU - Yamakata, Akira

AU - Kobayashi, Hisayoshi

AU - Kobayashi, Makoto

AU - Kakihana, Masato

PY - 2018

Y1 - 2018

N2 - Doping of Cr6+ into BiVO4 was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag+ or Fe3+ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.

AB - Doping of Cr6+ into BiVO4 was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag+ or Fe3+ of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.

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Expansion of the photoresponse window of a BiVO₄ photocatalyst by doping with chromium(vi)

Abstract

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